I don't get why a pitching coach would give a kid a false reading like that. It serves no purpose, especially since the point of taking the reading is to track progress.
In my opinion, money, ego, pride. Two PCs in my community. One who will tell anyone who listens how she can teach any 10U to throw 4 pitches at hit the mid 50s for only $35 private lesson or $20 for group. She advertises all over the place. Other PC only takes students by referral and charges $20 for private lesson. 2nd makes no promises and tells students they will only learn new pitches once they master the basics: fastball and change. In the rec league 14 students go to the first PC and 3 to the second. We have 3 top pitchers in rec league that are clearly above the rest. Guess which PC they go to? Yep the 2nd.